AgoraVideoFrameRate 视频帧率。 枚举值 AgoraVideoFrameRateFps1 1: 1 fps AgoraVideoFrameRateFps7 7: 7 fps AgoraVideoFrameRateFps10 10: 10 fps AgoraVideoFrameRateFps15 15: 15 fps AgoraVideoFrameRateFps24 24: 24 fps AgoraVideoFrameRateFps30 30: 30 fps